Dahermit, the practice has been kicked around on this site before. There are really two schools of thought. Some folks only use small pistol primers for pistols and small rifle for rifles. They have mixed views on .357 or 9 mm in rifles. Others, like myself, find it easier to just stock small rifle for both applications. It comes in handy when you order a lot of primers at one time. Inventory is simplified. Please note that it is not wise to use small pistol in a rifle. I rarely push the top end of my load data, at least with pistols. I have never experienced a problem and I shoot a lot.